Filtration device

Abstract

To further improve a filtering device for filtering sludge from a coolant liquid for a machine tool while following the former invention of the present inventor which has gained popularity in the market.SOLUTION: The filtering device 1 filters sludge from a coolant liquid for a machine tool. This filtering device 1 is provided with a cylindrical filter body 15 having upper and lower open ends for separating a suspension which is a coolant liquid containing sludge into a clear liquid which is the coolant liquid from which the sludge is removed and the sludge and a casing 2 for storing the filter body 15. The lower opening end of the filter body 15 is opened so as to allow the suspension to flow in, while the upper opening end of the filter body 15 is closed by a closing plate 18 against which the suspension flowing into the filter body 15 collides. The filtering device 1 is provided with a sludge removing part 30 for removing the deposited sludge deposited on the lower surface of the closing plate 18.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a filtering device for separating and removing cutting chips, grinding chips, etc. (hereinafter collectively referred to as sludge) from a coolant liquid of a machine tool used for cutting or grinding. [Background technology]

[0002] Conventionally, in cutting or grinding machine tools, coolant is supplied to the machining location of a workpiece with a tool for purposes such as maintaining machining accuracy and extending tool life. The used coolant supplied to the machining location is contaminated with sludge generated during machining. The used coolant is collected in a filtration device, where the sludge is separated and removed, before being circulated and supplied to the machine tool again. In other words, the coolant is repeatedly reused by passing through the filtration device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7267649 Summary of the Invention [Problem to be solved by the invention]

[0004] A variety of filtering devices have been proposed and are in use, but the present inventor previously proposed a filtering device in which the filter body is less likely to become clogged due to sludge adhesion in Patent Document 1. The filtering device in Patent Document 1 reduces the frequency of filter body replacement and has a high cost-cutting effect, and has therefore been highly evaluated in the market.

[0005] The present invention has been made with the aim of improving the previous invention, which has been well received in the market, while basically following suit. [Means for solving the problem]

[0006] The present invention is a filtering device that filters sludge from coolant liquid for machine tools, and comprises a cylindrical filter body that is open at both ends and separates a suspension, which is a coolant liquid containing sludge, into a clear liquid, which is a coolant liquid with the sludge removed, and sludge, and a casing that houses the filter body, the lower open end of the filter body is open to allow the suspension to flow in, while the upper open end of the filter body is closed by a closing plate against which the suspension that flows into the filter body collides, and a sludge removal section is provided that removes adhering sludge that has accumulated on the underside of the closing plate.

[0007] In the filtering device of the present invention, the sludge removal section may include a flexible tube hanging down from a through hole that passes vertically through the closure plate, and may be configured such that cleaning fluid supplied to the flexible tube is sprayed from the tip of the flexible tube inside the filter body, thereby irregularly displacing and deforming the flexible tube and causing the tip of the tube to collide with the underside of the closure plate, thereby removing the adhering sludge.

[0008] In the filtering device of the present invention, the sludge removal section may include a cleaning pipe inserted into a through hole that passes vertically through the closure plate, and a spray hole may be provided on the side surface of the lower end of the cleaning pipe for spraying cleaning fluid supplied to the cleaning pipe toward the underside of the closure plate.

[0009] In the filtration device of the present invention, the filter body may include a tubular filter cloth with both ends open and a tubular retaining cylinder with both ends open, and may be configured in the shape of a cylindrical cartridge with a double structure consisting of the filter cloth on the inside and the retaining cylinder on the outside. [Effects of the Invention]

[0010] According to the present invention, the suspension flowing in from one open end of the filter body can be caused to collide with a closing plate that closes the other open end of the filter body, thereby weakening and dispersing the liquid flow pressure of the suspension through collision with the closing plate, thereby slowing the flow. This makes it easier to aggregate and coarsen sludge, and to separate the coarsened sludge. Furthermore, according to the present invention, a sludge removal unit is provided that removes sludge deposited on the underside of the closing plate, so sludge adhering to the underside of the closing plate can be removed without disassembling the filtration device. This reduces the frequency of disassembly and cleaning of the filtration device, resulting in extremely high cost savings. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic front view of one embodiment of a filtration device. [Figure 2] FIG. 2 is a front view of the filter body of the embodiment. [Figure 3] FIG. 2 is a front cross-sectional view illustrating a filtering state in the filtering device of the embodiment. [Figure 4] FIG. 4 is an enlarged front cross-sectional view illustrating a fitting structure of an upper part of the filter body according to the embodiment. [Figure 5] FIG. 4 is an enlarged front cross-sectional view illustrating a fitting structure of a lower part of the filter body according to the embodiment. [Figure 6] FIG. 2 is an enlarged front cross-sectional view illustrating a cleaning unit according to the embodiment. [Figure 7] FIG. 10 is a front cross-sectional view of another embodiment of a filtration device. [Figure 8] FIG. 2 is a front cross-sectional view of the upper part of the embodiment, showing the state during filtration processing. [Figure 9] FIG. 2 is a front cross-sectional view of the upper part of the embodiment, showing the state during cleaning processing. [Figure 10] FIG. 10 is a front cross-sectional view showing another example of a filtering device. DETAILED DESCRIPTION OF THE INVENTION

[0012] Next, an embodiment of the present invention will be described with reference to the drawings. Figs. 1 to 6 show an embodiment of the present invention. Although not shown, a filtration device 1 of the embodiment filters sludge from a coolant liquid circulated and supplied to a cutting or grinding machine tool, and is disposed in the coolant liquid circulation line of the machine tool. In the following description, terms indicating specific directions or positions (e.g., "upper" and "lower") are used, but these terms are used for convenience of explanation and do not limit the technical scope of the present invention.

[0013] As shown in Figures 1 and 3, the filtration device 1 of this embodiment includes a casing 2 made of metal and shaped like a vertically long hollow container. The casing 2 is erected on a machine base 26. The casing 2 is composed of a lower case 3 that is funnel-shaped and opens upward, and an upper case 4 that is cylindrical and opens downward. A lower flange 5 that protrudes from the lower case 3 to the outer periphery (radially outward) is fixed to the upper end of the lower case 3 by welding or the like, and an upper flange 6 that protrudes from the upper case 4 to the outer periphery (radially outward) is fixed to the lower end of the upper case 4 by welding or the like.

[0014] The upper case 4 is composed of a cylindrical upper case cylindrical body 41 that is open at the top and bottom, and an upper case lid body 42 that closes the top of the upper case cylindrical body 41. A cylindrical upper flange 43 that protrudes from the upper case cylindrical body 41 toward the outer periphery is fixed to the upper end of the upper case cylindrical body 41 by welding or the like. The upper case lid body 42 is pot-shaped with a downward opening, and a lid flange 44 that protrudes from the upper case lid body 42 toward the outer periphery is fixed to the lower end of the upper case lid body 42 by welding or the like. The upper and lower flanges 44, 43 are butted together via a packing (not shown) and fastened together with bolts 45 and nuts 46, thereby connecting the upper case cylindrical body 41 and the upper case lid body 42 to form the upper case 4 that is a cylindrical box that is open downward.

[0015] In addition, the upper flange 6 of the upper case 4 and the lower flange 5 of the lower case 3 are butted together via a gasket (not shown), and the upper and lower flanges 6, 5 are fastened together with bolts 7 and nuts 8, thereby connecting the upper case 4 and the lower case 3 to form a casing 2 in the shape of a vertically elongated hollow container.

[0016] A suspension inlet pipe 9 is connected to a portion of the lower case 3 near the upward opening, which supplies a coolant liquid (suspension) containing sludge into the lower case 3. A clarified liquid outlet pipe 10 is connected to a portion of the upper case 4 near the downward opening, which discharges the coolant liquid (clarified liquid) from which sludge has been removed from the upper case 4. A sludge discharge pipe 11 is connected to the bottom of the lower case 3, which discharges sludge (also known as cake).

[0017] A cleaning pipe 31 of the sludge removal unit 30, which will be described later, is inserted liquid-tightly through an insertion hole 42a provided in the upper part of the upper case 4 (upper case lid 42) via a packing (not shown). As shown in FIG. 1, a cleaning fluid flow path 32 for supplying cleaning fluid is connected to the upper end of the cleaning pipe 31. A manually or automatically operable opening / closing valve 33 is provided in the cleaning fluid flow path 32. Although not shown, the suspension inlet pipe 9, the clear liquid outlet pipe 10, and the sludge discharge pipe 11 are each provided with an opening / closing valve that can be manually or automatically operated.

[0018] An impact dispersion plate 14, which is inclined diagonally downward and faces the outlet of the suspension inlet pipe 9, is fixed by welding or the like inside the lower case 3. The suspension flowing into the lower case 3 from the suspension inlet pipe 9 is caused to collide with the impact dispersion plate 14, dispersing the liquid flow pressure, thereby reducing the load acting on the filter cloth 16 and the retaining cylinder 17 (details of which will be described later) during the filtration process.

[0019] A filter body 15 that separates the suspension into a clear liquid and sludge (cake, filter residue) is housed within the casing 2. The filter body 15 includes a cylindrical filter cloth 16 with upper and lower openings formed in a single layer or multiple layers of synthetic fiber nonwoven fabric or woven or knitted fabric, and a cylindrical retaining tube 17 with upper and lower openings made of a liquid-permeable plate such as a perforated plate or wire mesh.

[0020] The filter cloth 16 is inserted inside the retaining cylinder 17. The upper and lower open ends of the filter cloth 16 are folded back outward at the corresponding open ends of the retaining cylinder 17. The folded back portions are fixed to the retaining cylinder 17 with waterproof tape, O-rings, or the like. Therefore, the filter body 15 is basically configured in the shape of a cylindrical cartridge with a double structure, with the filter cloth 16 on the inside and the retaining cylinder 17 on the outside (see Figures 3 to 5). By having the retaining cylinder 17 bear the liquid flow pressure during the filtration process, the load acting on the filter cloth 16 is reduced and excessive swelling and deformation of the filter cloth 16 due to the liquid flow pressure is suppressed.

[0021] A disk-shaped closing plate 18 that closes the upper open end of the holding cylinder 17 with the filter cloth 16 is attached to the upper open end. An outward-projecting, flange-shaped (annular) flange plate 20 is attached to the lower open end of the holding cylinder 17 with the filter cloth 16. Therefore, the upper open end of the holding cylinder 17 with the filter cloth 16 is closed by the closing plate 18, and the lower open end of the holding cylinder 17 with the filter cloth 16 opens downward through the opening in the flange plate 20.

[0022] In this embodiment, a downward fitting groove 19, which opens downward and into which the upper opening end of the retaining cylinder 17 with the filter cloth 16 attached thereto is inserted, is formed on the lower surface of the closure plate 18 (see FIGS. 3 and 4). An upward fitting groove 21, which opens upward and into which the lower opening end of the retaining cylinder 17 with the filter cloth 16 attached thereto is inserted, is formed on the upper surface of the flange plate 20 (see FIGS. 3 and 5).

[0023] With the upper open end of the retaining cylinder 17 with the filter cloth 16 fitted into the downward fitting groove 19 of the closure plate 18 and the lower open end of the retaining cylinder 17 with the filter cloth 16 fitted into the upward fitting groove 21 of the flange plate 20, the closure plate 18 and the flange plate 20 are fastened together so as to draw them together using a plurality of stay bolts 22 having male threads formed on at least both ends. As a result, the retaining cylinder 17 with the filter cloth 16 is held between the closure plate 18 and the flange plate 20 (see FIGS. 2 and 3). In this embodiment, cut bolts having male threads formed all over are used as the stay bolts 22.

[0024] As shown in Figures 3 and 6, the closure plate 18 has a through-hole 34 that penetrates vertically. In this embodiment, the through-hole 34 is provided in the center of the closure plate 18. A cleaning pipe 31 is inserted into the through-hole 34. The cleaning pipe 31 is fixed to the closure plate 18 in a liquid-tight manner by welding or the like. The lower end of the cleaning pipe 31 is located below the lower surface of the closure plate 18. On the other hand, the upper end of the cleaning pipe 31 is located above the upper case 4.

[0025] On the side surface of the lower end of the cleaning pipe 31, there are provided ejection holes 35 for ejecting the cleaning fluid supplied to the cleaning pipe 31 toward the underside of the closure plate 18. The ejection holes 35 are located below the underside of the closure plate 18. In this embodiment, on the side surface of the lower end of the cleaning pipe 31, a plurality of (e.g., eight) ejection holes 35 are provided evenly in the circumferential direction of the cleaning pipe 31.

[0026] 3, an annular mounting flange 23 on which the flange plate 20 of the filter body 15 rests from above is fixed by welding or the like to protrude inward in a position inside the lower case 3 above the impact dispersion plate 14. The filter body 15 is placed on the lower case 3 so that the flange plate 20 overlaps the mounting flange 23 from above, and the flange plate 20 of the filter body 15 and the mounting flange 23 of the lower case 3 are fastened together with a plurality of bolts 24, thereby fixing the filter body 15 to the lower case 3.

[0027] The upper case cylindrical body 41 of the upper case 4 is then placed over the filter body 15, the upper and lower flanges 6, 5 are butted together via a packing (not shown), and the upper and lower flanges 6, 5 are fastened together with bolts 7 and nuts 8, thereby connecting the lower case 3 and the upper case cylindrical body 41. The cleaning pipe 31 is then inserted through the insertion hole 42a of the upper case lid body 42 via a packing (not shown), the upper case lid body 42 is placed over the upper case cylindrical body 41, the upper and lower flanges 44, 43 are butted together via a packing (not shown), and the upper and lower flanges 44, 43 are fastened together with bolts 45 and nuts 46, thereby completing the casing 2 with the filter body 15 housed inside. Therefore, the interior of the lower case 3 and the interior of the upper case 4 are in communication only via the lower open end of the filter body 15.

[0028] In the above configuration, when filtering coolant liquid (suspension) containing sludge, the suspension that flows into the lower case 3 of the casing 2 from the suspension inlet pipe 9 flows into the downward-opening filter body 15 in the upper case 4, and passes through the filter body 15 from the inside to the outside, thereby performing a filtration process that separates the suspension into a clear liquid (coolant liquid with sludge removed) and sludge, and the clear liquid is released from the clear liquid outlet pipe 10.

[0029] When the filtering device 1 is performing the filtering process, the open / close valve 33 of the cleaning fluid flow path 32 is closed, thereby preventing the suspension from flowing into the cleaning pipe 31.

[0030] Here, sludge with a high specific gravity does not enter the filter body 15, or even if it does enter the filter body 15, it settles without adhering to the inner surface (filter cloth 16) and remains in the lower case 3. Sludge with a low specific gravity adheres to the inner surface (filter cloth 16) of the filter body 15 and gradually increases in thickness (aggregates and becomes coarse), and the coarse particles peel off and fall off from the inner surface (filter cloth 16) of the filter body 15 due to their own weight and the liquid flow pressure of the suspension, and drop down into the lower case 3.

[0031] In the case of coolant for machine tools, the sludge is metallic and has a high specific gravity, so it tends to settle under its own weight and continues to sink even during the filtration process. As a result, in this embodiment, clogging of the inner surface of the filter body 15 (filter cloth 16) is extremely unlikely to occur, the frequency of replacement of the filter body 15 can be minimized, and the cost reduction effect is extremely high.

[0032] In this embodiment, the suspension flowing from the lower case 3 into the filter body 15 flows from bottom to top and collides with the closure plate 18 that closes the upper open end of the retaining cylinder 17 with the filter cloth 16 attached, and the liquid flow pressure is weakened by the collision with the closure plate 18. If the liquid flow pressure of the suspension is dispersed and the flow is slowed, the sludge becomes more likely to aggregate and become coarse, and the coarse sludge becomes more likely to descend into the lower case 3. Furthermore, because the liquid flow pressure of the suspension can be dispersed and the flow can be slowed by the collision with the closure plate 18, the load acting on the filter cloth 16 and the retaining cylinder 17 during the filtration process is of course reduced.

[0033] The retaining cylinder 17 with the filter cloth 16 extends long along the flow direction (vertical direction) of the suspension, and the flow direction of the suspension and the longitudinal direction of the filter cloth 16 are parallel, so the liquid flow pressure of the suspension is unlikely to act directly on the filter cloth 16. Therefore, according to the embodiment, there is no or almost no risk that the filter cloth 16 will be broken by the liquid flow pressure of the suspension.

[0034] In the embodiment, the suspension flowing from the lower case 3 into the filter body 15 collides with the closure plate 18, which can cause sludge to adhere and accumulate on the lower surface of the closure plate 18 and on the upper portion of the inner circumferential surface of the filter body 15. The adhered sludge accumulated on the lower surface of the closure plate 18 clogs the upper portion of the inner circumferential surface of the filter body 15 (filter cloth 16), so it is preferable to remove the adhered sludge accumulated on the lower surface of the closure plate 18.

[0035] However, in order to remove the sludge adhering to the underside of the closure plate 18, it is necessary to disassemble the filtration device 1 and separate the filter body 15 from the closure plate 18. Such disassembly work is extensive and increases the burden on the worker, and there is also a risk of damaging the filter cloth 16 when removing the filter body 15 from the closure plate 18 and reassembling it.

[0036] In the embodiment, a sludge removal unit 30 is provided that sprays a cleaning fluid toward the underside of the closure plate 18, so that sludge adhering to the underside of the closure plate 18 and the upper portion of the inner circumferential surface of the filter body 15 can be removed without disassembling the filtration device 1. Here, the cleaning fluid is, for example, air, but it may also be a gas other than air, or a liquid such as water or a coolant liquid (clean liquid).

[0037] As shown in FIG. 6 , the inflow of coolant (suspension) into the filtration device 1 is stopped, and the sludge is discharged from the sludge discharge pipe 11. Then, with the sludge discharge pipe 11 open, the on-off valve 33 (see FIG. 1 ) of the cleaning fluid flow path 32 is opened to supply cleaning fluid to the cleaning pipe 31. For example, an air compressor is connected to the cleaning fluid flow path 32, and compressed air is supplied to the cleaning pipe 31 via the cleaning fluid flow path 32 and the on-off valve 33 and is sprayed from each nozzle hole 35 at the lower end of the cleaning pipe 31 toward the underside of the closure plate 18. The compressed air sprayed from the nozzle holes 35 toward the underside of the closure plate 18 peels off the adhering sludge from the underside of the closure plate 18. The peeled-off adhering sludge falls through the filter body 15 into the lower case 3 and is discharged from the sludge discharge pipe 11.

[0038] As described above, according to the embodiment, the sludge removal unit 30 is provided to spray cleaning fluid toward the underside of the closure plate 18, so that sludge deposited on the underside of the closure plate 18 and on the upper portion of the inner circumferential surface of the filter body 15 can be removed from the closure plate 18 without disassembling the filtration device 1. This reduces the frequency of disassembly and cleaning of the filtration device 1, resulting in a significant cost reduction effect.

[0039] 7 to 9 show another embodiment of the present invention. In this embodiment, components having the same configuration and function as those in the previous embodiment are assigned the same reference numerals as those in the previous embodiment, and detailed descriptions thereof will be omitted.

[0040] 7 to 9, in this embodiment, the sludge removal section 50 of the filtration device 1 includes a flexible tube 52 hanging down from a through-hole 53 that passes vertically through the closure plate 18. The flexible tube 52 is a flexible tube made of resin, rubber, or the like, such as a silicone tube.

[0041] The closure plate 18 has a through-hole 53 formed therethrough that penetrates vertically. In this embodiment, the through-hole 53 is provided in the center of the closure plate 18. The lower end of a cleaning pipe 51 is inserted into the through-hole 53. The cleaning pipe 51 is fixed to the closure plate 18 in a liquid-tight manner by welding or the like. The cleaning pipe 51 is inserted into the insertion hole 42a of the upper case cover 42 with a packing material (not shown) interposed between the cleaning pipe 51 and the insertion hole 42a. The upper end of the cleaning pipe 51 is located above the upper case cover 42 of the upper case 4.

[0042] 1 to 6, a cleaning fluid flow path 32 (see FIG. 1) for supplying a cleaning fluid is connected to the cleaning pipe 51. A manually or automatically operable opening / closing valve 33 (see FIG. 1) is provided in the cleaning fluid flow path 32.

[0043] One end (upper end) of the flexible tube 52 is inserted into the lower end of the cleaning pipe 51 so as not to come off. That is, the flexible tube 52 is disposed inside the filter body 15 while hanging down from the through-hole 53, and is provided so as to be displaceable and deformable when a force is applied. In this embodiment, the flexible tube 52 is slightly curved, and the tip opening of the tube tip portion 52a is positioned offset from the central axis of the through-hole 53.

[0044] 8, when filtering coolant liquid (suspension), similar to the embodiment of FIGS. 1 to 6, the suspension flows from the lower case 3 into the filter body 15 from bottom to top and collides with the closing plate 18 that closes the upper open end of the retaining cylinder 17 with the filter cloth 16. This flow of suspension causes the flexible tube 52 to bend and deform. This closes the flexible tube 52, preventing the suspension from flowing into the cleaning pipe 51 through the flexible tube 52.

[0045] Furthermore, in this embodiment, by closing the on-off valve 33 provided in the cleaning fluid flow path 32 to which the cleaning pipe 51 is connected, it is possible to prevent the suspension from flowing into the cleaning pipe 51 even if the flexible tube 52 is not completely blocked. Note that even if the on-off valve 33 is open or not provided, the flexible tube 52 is bent and blocked by the flow of the suspension during the filtration process, making it possible to prevent or suppress the suspension from flowing into the cleaning pipe 51.

[0046] In this embodiment, the suspension collides with the closure plate 18, which can cause sludge to accumulate on the underside of the closure plate 18 and on the upper inner periphery of the filter body 15. Therefore, in this embodiment, a cleaning fluid is supplied to the flexible tube 52 of the sludge removal unit 50, so that the sludge adhering to the underside of the closure plate 18 and on the upper inner periphery of the filter body 15 can be removed.

[0047] 9, when cleaning the inside of the filter body 15, cleaning fluid is ejected from the tube tip 52a of the flexible tube 52, causing the flexible tube 52 to irregularly displace and deform (flutter). Then, the middle part of the flexible tube 52 and the tube tip 52a collide with the adhering sludge inside the filter body 15, thereby making it possible to remove the adhering sludge. This allows the adhering sludge deposited on the underside of the closure plate 18 to be removed from the closure plate 18 without disassembling the filtration device 1.

[0048] As described above, in this embodiment, the sludge removal unit 50 is provided, which causes the flexible tube 52, which is displaceable and deformable within the filter body 15, to collide with the underside of the closure plate 18, so that sludge adhering to the underside of the closure plate 18 can be removed without disassembling the filtration device 1. Here, the cleaning fluid is, for example, air, but it may also be a gas other than air, or a liquid such as water or a coolant liquid (clean liquid).

[0049] The material of the flexible tube 52 is not limited to silicone, and may be any material that is flexible and resistant to the coolant liquid. Such materials may include, for example, synthetic rubber such as urethane rubber or butadiene rubber, soft vinyl chloride, polyolefin, polyester, elastomer, polyurethane, etc.

[0050] The length, outer diameter, and inner diameter of the flexible tube 52 may be any dimension that allows the tube tip 52a to be irregularly displaced, deformed, and fluttered when the cleaning fluid is sprayed from the tube tip 52a, and to collide with the underside of the closure plate 18. The length of the flexible tube 52 is preferably such that the tube tip 52a collides with an upper portion of the inner circumferential surface of the filter body 15 when the flexible tube 52 is irregularly displaced, deformed, and fluttered.

[0051] Fig. 10 shows another example of the filter body 15 in the filtering device 1. Fig. 10 also shows yet another embodiment of the present invention. In this another example, components having the same configuration and function as the previous embodiment are assigned the same reference numerals as the previous embodiment, and detailed descriptions thereof will be omitted.

[0052] 10, outwardly projecting clamping flanges 27, 28 are fixed by welding or the like to the upper and lower open ends of the holding tube 17. The upper and lower open ends of the filter cloth 16 inserted inside the holding tube 17 are bent so as to overlap the outer surfaces of the corresponding clamping flanges 27, 28, and are adhered with waterproof tape or the like. It is preferable to make cuts in the upper and lower open ends of the filter cloth 16 so that they can be easily overlapped on the outer surfaces of the corresponding clamping flanges 27, 28.

[0053] With the closure plate 18 placed on the upper clamping flange 27 from above, the upper clamping flange 27 and the closure plate 18 are fastened together with a plurality of bolts 29. The upper open end of the retaining cylinder 17 with the filter cloth 16 attached is closed by the closure plate 18. The bent portion of the upper open end of the filter cloth 16 is clamped by the upper clamping flange 27 and the closure plate 18, which are fastened together with the bolts 29.

[0054] With the flange plate 20 overlapping the lower clamping flange 28 from below, the lower clamping flange 28 and the flange plate 20 are fastened together with a plurality of bolts 24. The lower open end of the retaining cylinder 17 with the filter cloth 16 opens downward through the opening in the flange plate 20. The lower clamping flange 28 and the flange plate 20, which are fastened together with the bolts 24, clamp the bent portion of the lower open end of the filter cloth 16.

[0055] A plurality of bolts 24 fastening the lower clamping flange 28 and the flange plate 20 penetrate the lower clamping flange 28 and the flange plate 20. The filter body 15 is placed on the lower case 3 so that the flange plate 20 overlaps the mounting flange 23 from above, and the flange plate 20 of the filter body 15 is fastened to the mounting flange 23 of the lower case 3 with a group of bolts 24, thereby fixing the filter body 15 to the lower case 3. In other words, the filter body 15 is fixed to the lower case 3 by fastening the lower clamping flange 28, flange plate 20, and mounting flange together with a group of bolts 24. Even when configured as in this other example, the same effects as those of the previous embodiment are achieved.

[0056] The configuration of each part of the present invention is not limited to the illustrated embodiment and can be modified in various ways without departing from the spirit of the present invention. For example, the cartridge-shaped filter cloth 16-attached retaining tube 17 is not limited to one, but may include multiple retaining tubes 17. When multiple filter cloths 16-attached retaining tubes 17 are used, in the configuration of the previous embodiment, the fitting grooves 19, 21 of the closure plate 18 and flange plate 20 can be formed to correspond to the number of filter cloths 16-attached retaining tubes 17. In the configuration of another example, fitting holes corresponding to the number of filter cloths 16-attached retaining tubes 17 can be formed in the clamping flanges 27, 28, and the upper and lower open ends of the retaining tube 17 can be fitted into each fitting hole to secure the retaining tube 17.

[0057] When a plurality of holding tubes 17 equipped with filter cloths 16 are used, it is preferable to provide a sludge removal unit 30 for each holding tube 17. Furthermore, the sludge removal unit in the present invention is not limited to one that uses a cleaning pipe 31 or flexible tube 52 having ejection holes 35, and may have any configuration as long as it is capable of removing the adhering sludge accumulated on the underside of the closure plate 18.

[0058] Furthermore, the number of ejection holes 35 in the sludge removal section 30 is not limited to eight, and may be seven or less, or nine or more. Furthermore, a single closure plate 18 may be provided with a plurality of sludge removal sections 30 (through holes 34 and cleaning pipes 31).

[0059] Furthermore, a single closure plate 18 may be provided with a plurality of sludge removal sections 50 (cleaning pipes 51, flexible tubes 52, and through holes 53). The attachment structure of the flexible tubes 52 to the closure plate 18 is not limited to the flexible tubes 52 being fixed to the cleaning pipes 51, but may be any structure in which the flexible tubes 52 hang down from the through holes 53. For example, a fixture may be used to fix the flexible tubes 52 to the through holes 53, or the flexible tubes 52 may be fixed to the through holes 53 with an adhesive or the like. [Explanation of symbols]

[0060] 1. Filtration equipment 2 Casing 15 Filter body 16 Filter cloth 17 Holding cylinder 18 Closure plate 30 Sludge removal section 31 Cleaning pipe 32 Cleaning fluid flow path 33 Opening and closing valve 34 Through hole 35 Spout hole 50 Sludge removal section 52 Flexible Tube 53 Through hole

Claims

1. A filtration device for filtering sludge from a coolant liquid for a machine tool, The apparatus comprises a cylindrical filter body with upper and lower open ends that separates a suspension, which is a coolant liquid containing sludge, into a clear liquid, which is a coolant liquid from which the sludge has been removed, and the sludge, and a casing that houses the filter body, a lower open end of the filter body is open to allow the suspension to flow in, while an upper open end of the filter body is closed by a closing plate with which the suspension that has flowed into the filter body collides, A sludge removal unit is provided to remove sludge deposited on the lower surface of the closing plate. Filtration equipment.

2. The sludge removal unit includes a flexible tube hanging down from a through hole that passes through the closure plate in the vertical direction, The cleaning fluid supplied to the flexible tube is ejected from the tube tip of the flexible tube inside the filter body, thereby irregularly displacing and deforming the flexible tube and causing the tube tip to collide with the lower surface of the closing plate, thereby removing the adhering sludge. The filtration device of claim 1 .

3. the sludge removal unit includes a cleaning pipe inserted into a through hole that vertically penetrates the closing plate, a nozzle hole for spraying the cleaning fluid supplied to the cleaning pipe toward the lower surface of the closure plate is provided on a side surface of the lower end of the cleaning pipe; The filtration device of claim 1 .

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